During exploration and extraction of hydrocarbon deposits, the risk of elevated methane concentration above the lower explosive limit occurs. In some cases a higher concentration of hydrogen sulfide threatening the health and life of the crew also may be observed. The use of a portable gas detector Dräger X-am 5600 for constant monitoring of methane and hydrogen sulfide concentration in dangerous situations is proposed in the paper. Thanks to the IR sensors and modern electrochemical sensors, this detector allows for monitoring of 6 types of gases simultaneously. The applied infrared sensor IR EX allows for measuring explosive and combustible gases both within the lower explosive limit, and also measuring of methane in the range of 0 to 100 vol.%. The measured values are stored in the computer and also sent to the central through GSM.